Because teen people have too much purposes about life to do..So with the Sims series they can do on the game (whatever they want to do on real life)love,friendship,getting job are the basics but the another things are important also for a teen..I know this because ım studying in a university and we discuss that in the class with our teacher(The sims was the topic of our lesson in that day)
All people said 'we are the leader of our life on this game.And all teens like being leaderin their life..